A graph of price, P, versus quantity, Q, is a demand curve consisting of a straight line descending from (0, 100) to (50, 0). The following points are shown. (5, 90), (10, 80), (15, 70), (20, 60), (25, 50), (30, 40), (35, 30), (40, 20), (45, 10). Refer to Figure 5-3 At a price of $70 per unit, sellers' total revenue equals a. $1,050. b. $700. c. $1,250. d. $1,400